HI, I recently purchased a L305dt and have a problem with the pto. With the tractor running, no implement, pto will engage with no problem, either speed. Once hook up an implement(wood chipper) the pto lever can't be engaged, just grinds. I have to turn the tractor off, engage pto then restart. The lever for the clutch stop is not "on" clutch goes to floor board. With no implement , watching the pto shaft, once engaged and clutch is depressed it keeps spinning. Is there an adjustment for the pto or is there problem with clutch ?? Thanks in advance for any help.